powerpc: Convert mpic locks to raw_spinlock

mpic_lock, irq_rover_lock and fixup_lock need to be real spinlocks in
RT. Convert them to raw_spinlock.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/arch/powerpc/include/asm/mpic.h b/arch/powerpc/include/asm/mpic.h
index a002682..61913d9 100644
--- a/arch/powerpc/include/asm/mpic.h
+++ b/arch/powerpc/include/asm/mpic.h
@@ -289,7 +289,7 @@
 #ifdef CONFIG_MPIC_U3_HT_IRQS
 	/* The fixup table */
 	struct mpic_irq_fixup	*fixups;
-	spinlock_t		fixup_lock;
+	raw_spinlock_t	fixup_lock;
 #endif
 
 	/* Register access method */